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Python上でintのFourCCを文字列に復元する雑なメモ

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GStreamerやOpenCVで動画のFourCCを取得すると、以下のように数値で帰ってくる

 In [1]: import cv2
 
 In [2]: cap = cv2.VideoCapture('./XXXXXX.avi')
 
 In [3]: cap.get(cv2.CAP_PROP_FOURCC)
 Out[3]: 844713045.0

これをリトルエンディアンでbyte化 -> UTF-8でデコードすると、4文字の文字列に変換できる

 In [4]: fourcc = list((fourcc_int.to_bytes(4, 'little').decode('utf-8')))
 
 In [5]: fourcc
 Out[5]: ['U', 'L', 'Y', '2']
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